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题库 / OG2017Q-PS-172
A certain grocery purchased x pounds of produce for p dollars per pound. If y pounds of the produce had to be discarded due to spoilage and the grocery sold the rest for s dollars per pound, which of the following represents the gross profit on the sale of the produce?
(x - y)s - xp
(x - y)p - ys
(s - p)y - xp
xp - ys
(x - y)(s - p)
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discard， 抛弃